08-05-2011
Here is what I've found:
Before deleting the snapshot, both the original ZFS Z and its snapshot showed 130 GB used. After Z's snapshot was deleted, Z shows 500KB used.
Actually our DBA removed almost all of the data in Z. That must be why the snapshot showed as much space as Z used.
After its snapshot was deleted, Z was nearly empty.
Make sense??
Btw, 'zpool history' does not show zfs command history.
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